/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.spark.sql.internal.connector

import org.apache.spark.sql.connector.util.V2ExpressionSQLBuilder

/**
 * The builder to generate `toString` information of V2 expressions.
 */
class ToStringSQLBuilder extends V2ExpressionSQLBuilder {
  override protected def visitUserDefinedScalarFunction(
      funcName: String, canonicalName: String, inputs: Array[String]) =
    s"""$funcName(${inputs.mkString(", ")})"""

  override protected def visitUserDefinedAggregateFunction(
      funcName: String,
      canonicalName: String,
      isDistinct: Boolean,
      inputs: Array[String]): String = {
    val distinct = if (isDistinct) "DISTINCT " else ""
    s"""$funcName($distinct${inputs.mkString(", ")})"""
  }
}
